Refrakshion

For fysiks, refrakshion bi di ridairekshion of a wave as e pas from wan medium to anoda. Di ridairekshion fit dé kausd bai di chenj in di wave spid or bai a chenj in di medium. Refrakshion of lait bi di mos komonli obsavd fenomenon, but other waves such as saund waves and wata waves also dé experiens refrakshion. Haw moch a wave dé refrakted dé detamaiynd bai di chenj in wave spid and di inishial dairekshion of wave propagashion relativ to di direkshion of chenj in spid.

A ray of lait dé refrakted for a plastik blok

Refrakshion of lait for di intafais between tuw media of different refraktiv indisis, with n₂ > n₁. Since di feiz velociti dé lowa for di sekond medium (v₂ < v₁), di angul of refrakshion θ₂ dé les than di angul of incidens θ₁; dat is, di ray for di haia-index medium dé klosa to di normal.

Wen a wave dé muv into a slowa medium di wavefronts ga get kompresd. For di wavefronts to stay konnekted at di baundri di wave must chenj dairekshion.